The Notch Filter decoder

It can be found in most every inexpensive TV sets and most standard VHS machines. The presence of a Notch Filter in a TV is easy to detect. Display the SMPTE Resolution Chart Video Essentials VE T17 C13 at the composite video input to the monitor and look for the horizontal resolution wedge, the vertical lines on either side of the center circle, to show a lot of color from about 240 lines on up. A Notch Filter can also be incorporated in a Comb Filter decoder.